Re: [PATCH 4/4] kunit: qemu_configs: Add microblaze configuration

[Michal Simek <michal.simek@amd.com>]

On 8/31/26 17:43, Thomas Weißschuh wrote:
> On 2026-08-31 12:48:08+0200, Michal Simek wrote:
>> On 8/4/26 07:32, Thomas Weißschuh wrote:
>>> Add a basic configuration to run kunit tests on microblaze.
>>>
>>> Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
>>> ---
>>>    tools/testing/kunit/qemu_configs/microblaze.py | 17 +++++++++++++++++
>>>    1 file changed, 17 insertions(+)
>>>
>>> diff --git a/tools/testing/kunit/qemu_configs/microblaze.py b/tools/testing/kunit/qemu_configs/microblaze.py
>>> new file mode 100644
>>> index 000000000000..ff012095e77d
>>> --- /dev/null
>>> +++ b/tools/testing/kunit/qemu_configs/microblaze.py
>>> @@ -0,0 +1,17 @@
>>> +# SPDX-License-Identifier: GPL-2.0-only
>>> +from ..qemu_config import QemuArchParams
>>> +
>>> +QEMU_ARCH = QemuArchParams(linux_arch='microblaze',
>>> +						   kconfig='''
>>> +CONFIG_CPU_BIG_ENDIAN=y
>>
>> Big endian is quite old and I am even surprised that it is working.
> 
> Oh ok. This was the only configuration that I got working.
> 
>>> +CONFIG_SERIAL_UARTLITE=y
>>> +CONFIG_SERIAL_UARTLITE_CONSOLE=y
>>
>> I think it is just pure luck that this worked for you because you didn't
>> rewrite the most important parts of config.
>>
>> You should define at least these values
>>
>> CONFIG_KERNEL_BASE_ADDR=0x90000000
>> CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR=1
>> CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR=1
>> CONFIG_XILINX_MICROBLAZE0_USE_BARREL=1
>> CONFIG_XILINX_MICROBLAZE0_USE_DIV=0
>> CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL=1
>> CONFIG_XILINX_MICROBLAZE0_USE_FPU=0
>>
>> to be aligned with s3adsp1800
> 
> Will do.
> 
>> It will solve these two issues too.
>> ERROR: Microblaze BARREL, MSR, PCMP or DIV-different for kernel and DTS
>> ERROR: Microblaze HW_MUL-different for kernel and DTS
>>
>>> +CONFIG_MB_POWER_OFF_THROUGH_UNALIGNED_PC=y
>>> +''',
>>> +						   qemu_arch='microblaze',
>>> +						   kernel_path='arch/microblaze/boot/linux.bin',
>>> +						   kernel_command_line='kunit_shutdown=poweroff',
>>> +						   extra_qemu_params=[
>>> +							'-M', 'petalogix-s3adsp1800',
>>> +						   ],
>>> +)
>>>
>>
>> That's bring us to different topic. When qemu runs I see these 2 issues
>>
>> qemu-system-microblaze: -accel kvm: invalid accelerator kvm
>> qemu-system-microblaze: -accel hvf: invalid accelerator hvf
> 
> That is an artifact on how KUnit starts qemu. It should not matter.
> 
>> I don't have any issue if you want to wire big-endian version but would be
>> more useful to wire little endian version.
> 
> Understood. Let's try to have both.
> 
>> If there is an issue with memmove implementation I can't see any issue to
>> disable that options to let it pass from the beginning and solve it
>> separately.
> 
> Ack. Could you take care of this? I have next to no idea about microblaze.

On little endian this is passing. I can add it to my todo list but big endian is 
very very old and likely none is using it anymore.


> 
>> This should be fragment for Little endian.
> 
> Thanks, unfortunately this hangs for me with my distros QEMU 11.1.0.
> No output, 100% CPU usage during boot. I am using qemu-system-microblaze
> instead of qemu-system-microblazel, as the latter is not available
> anymore, but the former is documented to also handle little endian
> automatically.
> 

I built the latest qemu like this

../qemu/configure 
--target-list=microblaze-softmmu,microblaze-linux-user,microblazeel-linux-user 
--enable-gcrypt --disable-docs

/mnt/projects/xilinx-new-git/qemu.org/build-microblaze/qemu-system-microblaze 
--version
QEMU emulator version 11.1.50 (v11.1.0-779-gd2e570cc0f97)

And can't see any issue.

Thanks,
Michal


/mnt/projects/xilinx-new-git/qemu.org/build-microblaze/qemu-system-microblaze 
-nodefaults -m 1024 -kernel .kunit/arch/microblaze/boot/linux.bin -append 
'kunit.enable=1 kunit_shutdown=poweroff' -no-reboot -nographic -accel kvm -accel 
hvf -accel tcg -serial stdio -M petalogix-ml605
qemu-system-microblaze: -accel kvm: invalid accelerator kvm
qemu-system-microblaze: -accel hvf: invalid accelerator hvf
qemu-system-microblaze: falling back to tcg
qemu-system-microblaze: warning: nic xlnx.axi-ethernet.0 has no peer
random: crng init done
Ramdisk addr 0x00000000,
FDT at 0x5058e528
Linux version 7.3.0-rc1-00023-g5a713478d535 (monstr@monstr-desktop3) 
(microblazeel-amd-linux-gcc.real (GCC) 13.4.0, GNU ld (GNU Binutils) 
2.42.0.20240723) #11 Tue Sep  1 15:18:11 CEST 2026
setup_memory: min_low_pfn: 0x50000
setup_memory: max_low_pfn: 0x60000
setup_memory: max_pfn: 0x60000
OF: reserved mem: Reserved memory: No reserved-memory node in the DT
setup_cpuinfo: initialising
setup_cpuinfo: No PVR support. Using static CPU info from FDT
wb_msr
WB won't work properly
Zone ranges:
   DMA      [mem 0x0000000050000000-0x000000005fffffff]
   Normal   empty
Movable zone start for each node
Early memory node ranges
   node   0: [mem 0x0000000050000000-0x000000005fffffff]
Initmem setup node 0 [mem 0x0000000050000000-0x000000005fffffff]
pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
pcpu-alloc: [0] 0
Kernel command line: kunit.enable=1 kunit_shutdown=poweroff
printk: log buffer data + meta data: 131072 + 409600 = 540672 bytes
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes, linear)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
Built 1 zonelists, mobility grouping on.  Total pages: 65536
mem auto-init: stack:all(zero), heap alloc:off, heap free:off
SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
irq-xilinx: /axi/interrupt-controller@81800000: num_irq=6, edge=0x4
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 
7645041785100000 ns
ERROR: CPU CCF input clock not found
/axi/system-timer@83c00000: irq=2
ERROR: timer CCF input clock not found
clocksource: xilinx_clocksource: mask: 0xffffffff max_cycles: 0xffffffff, 
max_idle_ns: 19112604467 ns
xilinx_timer_shutdown
xilinx_timer_set_periodic
sched_clock: 32 bits at 100MHz, resolution 10ns, wraps every 21474836475ns
Console: colour dummy device 80x25
printk: legacy console [tty0] enabled
Calibrating delay loop... 1945.60 BogoMIPS (lpj=3891200)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
VFS: Finished mounting rootfs on nullfs
Memory: 253204K/262144K available (4023K kernel code, 596K rwdata, 832K rodata, 
161K init, 192K bss, 8436K reserved, 0K cma-reserved)
posixtimers hash table entries: 512 (order: 0, 2048 bytes, linear)
futex hash table entries: 256 (3072 bytes on 1 NUMA nodes, total 3 KiB, linear).
DMA: preallocated 128 KiB GFP_KERNEL|GFP_DMA pool for atomic allocations
clocksource: Switched to clocksource xilinx_clocksource
workingset: timestamp_bits=30 (anon: 25) max_order=16 bucket_order=0 (anon: 0)
io scheduler mq-deadline registered
io scheduler kyber registered
Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
83e00000.serial: ttyS0 MMIO:0x83e01000 (irq = 5, base_baud = 6250000) is a 16550A
printk: console [ttyS0] enabled
clk: Disabling unused clocks
KTAP version 1
1..118
     KTAP version 1
     # Subtest: example_init
     # module: kunit_example_test
     # is_init: true
     1..1
     ok 1 example_init_test
ok 1 example_init
     # miscdev_init: found misc device minor 15 available
     # miscdev_init: found misc device minor 128 available
     # miscdev_init: found misc device minor 0 available
     # miscdev_init: found misc device minor 254 available
     KTAP version 1
     # Subtest: miscdev_init
     # module: misc_minor_kunit
     # is_init: true
     1..7
         KTAP version 1
         # Subtest: miscdev_test_static_basic
         ok 1 lower static range, top